Fix virtual/override/final usage in Source/modules/.

Source/modules/filesystem/FileWriter.h

 /*
  * Copyright (C) 2010 Google Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 42 matching lines @@
     : public FileWriterBase
     , public EventTargetWithInlineData
 #endif
     , public ActiveDOMObject
     , public WebFileWriterClient {
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(FileWriterBase);
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(FileWriter);
 public:
     static FileWriter* create(ExecutionContext*);
-    virtual ~FileWriter();
+    ~FileWriter() override;
 
     enum ReadyState {
         INIT = 0,
         WRITING = 1,
         DONE = 2
     };
 
     void write(Blob*, ExceptionState&);
     void seek(long long position, ExceptionState&);
     void truncate(long long length, ExceptionState&);
     void abort(ExceptionState&);
     ReadyState readyState() const { return m_readyState; }
     FileError* error() const { return m_error.get(); }
 
     // WebFileWriterClient
-    virtual void didWrite(long long bytes, bool complete) override;
-    virtual void didTruncate() override;
-    virtual void didFail(WebFileError) override;
+    void didWrite(long long bytes, bool complete) override;
+    void didTruncate() override;
+    void didFail(WebFileError) override;
 
     // ActiveDOMObject
-    virtual void stop() override;
-    virtual bool hasPendingActivity() const override;
+    void stop() override;
+    bool hasPendingActivity() const override;
 
     // EventTarget
-    virtual const AtomicString& interfaceName() const override;
-    virtual ExecutionContext* executionContext() const override { return ActiveDOMObject::executionContext(); }
+    const AtomicString& interfaceName() const override;
+    ExecutionContext* executionContext() const override { return ActiveDOMObject::executionContext(); }
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(writestart);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(progress);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(write);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(abort);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(error);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(writeend);
 
     DECLARE_VIRTUAL_TRACE();
 
@@ skipping 27 matching lines @@
     long long m_numAborts;
     long long m_recursionDepth;
     double m_lastProgressNotificationTimeMS;
     Member<Blob> m_blobBeingWritten;
     int m_asyncOperationId;
 };
 
 } // namespace blink
 
 #endif // FileWriter_h